Automatic sear for automatic firearms



Odi 14, '1952 l=-` DE KIRALY AUTOMATIC SEAR FOR AUTOMATIC FIREARMS Filed Sept. 22, 1949 Patented Oct. 14, 1952 AUTOMATIC SEAR FOR AUTOMATIC FIREARMS Paul delKiraly, Ciudad Trujillo, Dominican Republic, assignor to The Hispaniola Corporation (La Hispaniola C..P. AJ, Ciudad Trujillo, Do-

rm of Dominican Reg minican Republic, 4a

public Application September 22, 1949, Serial No. 117,155

Y In Switzerland September 30, 1948 l My application for United States Patent Serial No. 117,154, filed September 22, 1949, describes a relatively light breech-bolt and a relatively heavy hammer which perform together their backwards run within the casing, but perform separately, in two different phases, their forwards run.

The purpose of this construction was to lag the ignition of the cartridge brought into the gun by the breech-bolt, in order to reduce the speed of the shooting during an automatic series fire. The experienceshows that the weight of the hammer must be insome cases as great as the weight of the breech-bolt and in other cases greater, what constitutes a mass-ratio up to now unknown in the automatic and non-automatic arms.

`This new distribution of the masses makes possible a good shooting speed with a light breechbolt running backwards along a short run, as well as for arms with'agun which moves slightly back as for arms with a fixed gun.

The drawing shows by way of example, one form of execution of the object of the invention. The ligure is an axial sectional view of the breechmechanism.

In the drawing, I designates the barrel which is rigidly secured to a barrel extension 2 and which can perform a slight recoil movement about 0.15 inch in the frame 3. 4 designates the breechbolt slidably arranged in the barrel extension 2, and 5 designates the striker which is slidably mounted within the breech-bolt. The breechbolt II is a hollow cylinder in which slides the front part of the striker which is likewise cylindrical. `IS designates the recoil spring the front end of which bears directly on the breech-bolt. 'I is the firing spring the front end of which bears on thefront wall of a boring provided in the striker.

The rear portion of the breech-bolt 4 is guided during the second phase of the recoil in the longitudinal inner straight wall of a rear casing ID3 fastened to the frame 3, substantially in the prolongation of the straight guiding wall of the barrel extension 2.

The breech-bolt 4, as well as the barrel I and barrel extension 2 are adapted to be locked before firing, by a crank-lever like locking member Ill-I3 pivoted at II to the frame and linked by a bolt I2 to the barrel extension 2. The hookshaped end I3 of this locking member engages a corresponding lower shoulder I4 of the breech bolt.

A toothed sear I8 is pivoted about the pin II 1 Claim. (Cl. 89-149) and carries a rearmost .tooth I'I, a second tooth I6 `and an upper protrusion I5. The` spring 2H tends to lift thesear I8 linto engagement eitherA inner rib IUI adapted to tilt the' catch 411-42 as will be hereinafter explained. z i

The striker 5 is provided atits rear end with a retaining shoulder 30 1having' ,al-vertical Wall 2| adapted to be engagedby the rearmost tooth I'I of the sear. The barrel extension 2 has a camshaped rear edge 28 on the path of which is located the protrusion I5. g

The sear I8 is adapted to catch, in ,their near rearmost positions, in single lire the breech-bolt and the Striker, in automatic nre, the striker alone. It is this latter case in which the new disposition of weight and movement of firing of the striker proves useful.-

At a shot the barrel with barrel-extension, breech-bolt and striker recoil, rst a short distance, Within which the breech-bolt is unlocked and, subsequently, barrel and barrel-extension stopped by the flange 58 of the rear casing |03. The breech-bolt 4 and the striker 5 continue, under the eiect of the required momentum and of the residual pressure in the barrel, their rearward travel, during which the striker is connected to the bolt by the catch 40, 42. Toward the end of their common rearward' movement this catch is depressed by the rib IUI of the rear casing |03, so that the striker 5 is disjoined from the breechbolt 4.

In automatic fire, the breech-bolt 4 snow free to run forward under the effect of the recoil spring 6. The striker 5 remains, in the meantime, caught on the tooth I'I of the sear I8.

When the breech-bolt arrives into its foremost position in the barrel-extension 2, breech-bolt, barrel-extension and barrel made an additional movement forward, the movement of locking. During this movement the rear edge or cam 28 of the barrel extension 2 glides over the protrusion I5 on the back of the seal- I8 and depresses this into lowest position. By this movement the striker 5 is released from the tooth II of the sear and now, when the breech-bolt has already been fully closed and locked. the striker moves forvward freely, until its point hits and ignites thev cap of the cartridge in the barrel.

This movement of'lring of the striker beiner only slightly, some1/@Jb of an inch, shorter than the totalrecoil of the breech-bolt and striker, a

comparatively'weak `ring spring isable/toime part to the striker the required impact. Under the eiect of a comparativelyv weak force the forward movement of the comparatively heavy striker will be slow, so that the ringof the car-v tridge in the barrel will sensibly be delayed. This fact makes itself especially Vfelt infull automatic "re, the rate of which is thus `conv'eni'entlyzslow'ed down.

The catch 40,' 42 reestablishes the connection between striker 5 and breech-bolt 4 shortly beis hereby not affected, not influenced.

1 `The weight of the striker 5 is here of about 1.3 times greater than the weight of the breech-bolt ,1, 4,.but in other alms, it could be up to twice as great masses between the vstriker andthe breech-bolt,

the striker can be made of,` an especially heavy In order to increase the ratio offthe metallic Aalloy and/ or the breech-bolt cany be made 'of'avlight alloy. l, i

Whatlclaims 1 `In a light automaticire arm comprising a frame; a .breech-bolt and striker mechanism, 1the recolof *whichfis controlled bythe pressure of.

th rns gases, in Qcmbinatiqhr @barrel having a hollow'rear extension movably supported by said frame for av shortrecohmovement therein; vsaid barrel extensioncomprisins `a lonsitudinn straight l guiding wall'and a cam-,shaped rear edge; a rear casing .fastened tothe frame and having a longitudinal inner straight wall substantially in the prolongation of said guiding, wall of the barrel extension; an elongated recessed straight breechboltv slidably located within said vbarrelfextension; a striker in the kform of an elongated straight body carrying a firing pin, vthe fore part of said striker being adapted to slide in said recessed breech-bolt and the rear part adapted to slide along said inner straight wall of the rear casing, said strikerl being provided vwitkna retaining shoulder; lmeansffor connecting *said breech-bolt 'and v,st'riker'to each other' substantially during the recoil; means for releasing said breech-,bolt from said striker substantially at the end of said recoil; a recoil spring' inserted between said rear casing and said breech-bolt; a firing spring inserted between said casing and striker; a toothed `sear pivoted to the frame and comprising at least a rearinost tooth and a protrusion, said protrusion being located in the path of said cam-shaped edge; said rearmost tooth being adapted to conftact said retaining shoulder of the striker in order fiore the point of the striker touches the cap f the cartridge in the barrel. The forward 'move-f ment, the functioning of the striker in generen.1v

vter-recoil movement, so that the breech-bolt y to catch the latter at the beginning of the counalone is able to move forwardly under the action of said recoil spring, until saidcam-shaped rear edge of the barreliextension strikes saidV protrusion, thus freeing the striker vitself for the firing forward movement, the main eiective cross sections and relative longitudinal dimensions of said breech-boltand said striker being so determined that the weight of this latter be at least equal to, up to a multiple of, the weight of the breech-bolt.

f AUL- mi KIRALY REFERENCES CITED The following referencesare, of'record'in the le of this patent: e

UNITED STATES PATENTS Great Britain June 24; 1929 

